WO1997015155A1 - Attribution de largeurs de bande - Google Patents

Attribution de largeurs de bande Download PDF

Info

Publication number
WO1997015155A1
WO1997015155A1 PCT/US1996/016686 US9616686W WO9715155A1 WO 1997015155 A1 WO1997015155 A1 WO 1997015155A1 US 9616686 W US9616686 W US 9616686W WO 9715155 A1 WO9715155 A1 WO 9715155A1
Authority
WO
WIPO (PCT)
Prior art keywords
mobile stations
channel
mobile station
mobile
messages
Prior art date
Application number
PCT/US1996/016686
Other languages
English (en)
Inventor
Alex Krister Raith
Alan Eric Sicher
Lars BILLSTRÖM
John Diachina
Raymond C. Henry
Karl-Erik Andersson
Steven Prokup
Original Assignee
Telefonaktiebolaget Lm Ericsson
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget Lm Ericsson filed Critical Telefonaktiebolaget Lm Ericsson
Priority to BR9611117A priority Critical patent/BR9611117A/pt
Priority to GB9808186A priority patent/GB2321166B/en
Priority to AU74530/96A priority patent/AU714610B2/en
Priority to DE19681599T priority patent/DE19681599B4/de
Publication of WO1997015155A1 publication Critical patent/WO1997015155A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/52—Allocation or scheduling criteria for wireless resources based on load
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/22—Performing reselection for specific purposes for handling the traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • Applicants' invention relates to electrical telecommunication, and more particularly to wireless communication systems, such as cellular and satellite radio systems, for various modes of operation (analog, digital, dual mode, etc.), and access techniques such as frequency division multiple access (FDMA), time divisional multiple access (TDMA), code divisional multiple access (CDMA), hybrid FDM A/TDM A/CDMA, for example.
  • FDMA frequency division multiple access
  • TDMA time divisional multiple access
  • CDMA code divisional multiple access
  • hybrid FDM A/TDM A/CDMA hybrid FDM A/TDM A/CDMA
  • D-AMPS digital advanced mobile phone service
  • TIA/EIA/IS-54-B is a dual-mode (analog and digital) standard, providing for analog compatibility together with digital communication capability.
  • the TIA/EIA/IS-54-B standard provides for both FDMA analog voice channels (AVC) and TDMA digital traffic channels (DTC).
  • AVCs and DTCs are implemented by frequency modulating radio carrier signals, which have frequencies near 800 megahertz (MHz) such that each radio channel has a spectral width of 30 kilohertz (KHz).
  • each radio channel is divided into a series of time slots, each of which contains a burst of information from a data source, e.g., a digitally encoded portion of a voice conversation.
  • the time slots are grouped into successive TDMA frames having a predetermined duration.
  • the number of time slots in each TDMA frame is related to the number of different users that can simultaneously share the radio channel. If each slot in a TDMA frame is assigned to a different user, the duration of a TDMA frame is the minimum amount of time between successive time slots assigned to the same user.
  • the successive time slots assigned to the same user which are usually not consecutive time slots on the radio carrier, constitute the user's digital traffic channel, which may be considered a logical channel assigned to the user.
  • digital control channels can also be provided for communicating control signals, and such a DCCH is a logical channel formed by a succession of usually non-consecutive time slots on the radio carrier.
  • the TIA/EIA/IS-54-B standard provided that each TDMA frame consists of six consecutive time slots and has a duration of 40 milliseconds (msec).
  • each radio channel can carry from three to six DTCs (e.g.
  • a full-rate DTC requires twice as many time slots in a given time period as a half-rate DTC, and in TIA/EIA/IS-54-B, each full-rate DTC uses two slots of each TDMA frame, i.e., the first and fourth, second and fifth, or third and sixth of a TDMA frame's six slots. Each half-rate DTC uses one time slot of each TDMA frame.
  • each DTC time slot 324 bits are transmitted, of which the major portion, 260 bits, is due to the speech output of the codec, including bits due to error correction coding of the speech output, and the remaining bits are used for guard times and overhead signalling for purposes such as synchronization.
  • the TDMA cellular system operates in a buffer-and-burst, or discontinuous-transmission, mode: each mobile station transmits (and receives) only during its assigned time slots. At full rate, for example, a mobile station might transmit during slot 1, receive during slot 2, idle during slot 3, transmit during slot 4, receive during slot 5, and idle during slot 6, and then repeat the cycle during succeeding TDMA frames. Therefore, the mobile station, which may be battery- powered, can be switched off, or sleep, to save power during the time slots when it is neither transmitting nor receiving.
  • cellular radio communication systems In addition to voice or traffic channels, cellular radio communication systems also provide paging/access, or control, channels for carrying call-setup messages between base stations and mobile stations.
  • paging/access, or control, channels for carrying call-setup messages between base stations and mobile stations.
  • TIA/EIA/IS-54-B there are twenty -one dedicated analog control channels (ACCs), which have predetermined fixed frequencies for transmission and reception located near 800 MHz. Since these ACCs are always found at the same frequencies, they can be readily located and monitored by the mobile stations.
  • ACCs dedicated analog control channels
  • a mobile station in a TIA/EIA/IS-54-B system tunes to and then regularly monitors the strongest control channel (generally, the control channel of the cell in which the mobile station is located at that moment) and may receive or initiate a call through the corresponding base station.
  • the mobile station will eventually "lose” radio connection on the control channel of the "old” cell and tune to the control channel of the "new” cell.
  • the initial tuning and subsequent re-tuning to control channels are both accomplished automatically by scanning all the available control channels at their known frequencies to find the "best" control channel. When a control channel with good reception quality is found, the mobile station remains tuned to this channel until the quality deteriorates again. In this way, mobile stations stay "in touch" with the system.
  • a mobile station While in the idle state, a mobile station must monitor the control channel for paging messages addressed to it. For example, when an ordinary telephone (land- line) subscriber calls a mobile subscriber, the call is directed from the public switched telephone network (PSTN) to a mobile switching center (MSC) that analyzes the dialed number. If the dialed number is validated, the MSC requests some or all of a number of radio base stations to page the called mobile station by transmitting over their respective control channels paging messages that contain the mobile identification number (MIN) of the called mobile station. Each idle mobile station receiving a paging message compares the received MIN with its own stored MIN. The mobile station with the matching stored MIN transmits a page response over the particular control channel to the base station, which forwards the page response to the MSC.
  • PSTN public switched telephone network
  • MSC mobile switching center
  • the MSC Upon receiving the page response, the MSC selects an AVC or a DTC available to the base station that received the page response, switches on a corresponding radio transceiver in that base station, and causes that base station to send a message via the control channel to the called mobile station that instructs the called mobile station to tune to the selected voice or traffic channel.
  • a through- connection for the call is established once the mobile station has tuned to the selected AVC or DTC.
  • each TIA/EIA/IS-54-B radio channel can carry DTCs only, DCCHs only, or a mixture of both DTCs and DCCHs.
  • each radio carrier frequency can have up to three full-rate DTCs/DCCHs, or six half-rate DTCs/DCCHs, or any combination in between, for example, one full- rate and four half-rate DTCs/DCCHs.
  • the transmission rate of the DCCH need not coincide with the half-rate and full-rate specified in TIA/EIA/IS-54-B, and the length of the DCCH slots may not be uniform and may not coincide with the length of the DTC slots.
  • the DCCH may be defined on an TIA/EIA/IS-54-B radio channel and may consist, for example, of every n-th slot in the stream of consecutive TDMA slots.
  • the length of each DCCH slot may or may not be equal to 6.67 msec, which is the length of a DTC slot according to TIA/EIA/IS-54-B.
  • these DCCH slots may be defined in other ways known to one skilled in the art.
  • the communications link protocol is used to initiate and to receive cellular telephone calls.
  • the communications link protocol is commonly referred to within the communications industry as a Layer 2 protocol, and its functionality includes the delimiting, or framing, of Layer 3 messages. These Layer 3 messages may be sent between communicating Layer 3 peer entities residing within mobile stations and cellular switching systems.
  • the physical layer (Layer 1) defines the parameters of the physical communications channel, e.g. , radio frequency spacing, modulation characteristics, etc.
  • Layer 2 defines the techniques necessary for the accurate transmission of information within the constraints of the physical channel, e.g., error correction and detection, etc.
  • Layer 3 defines the procedures for reception and processing of information transmitted over the physical channel.
  • FIG. 1 schematically illustrates pluralities of Layer 3 messages 11, Layer 2 frames 13, and Layer 1 channel bursts, or time slots, 15.
  • each group of channel bursts corresponding to each Layer 3 message may constitute a logical channel, and as described above, the channel bursts for a given Layer 3 message would usually not be consecutive slots on an TIA/EIA/136 carrier. On the other hand, the channel bursts could be consecutive; as soon as one time slot ends, the next time slot could begin.
  • Each Layer 1 channel burst 15 contains a complete Layer 2 frame as well as other information such as, for example, error correction information and other overhead information used for Layer 1 operation.
  • Each Layer 2 frame contains at least a portion of a Layer 3 message as well as overhead information used for Layer 2 operation.
  • each Layer 3 message would include various information elements that can be considered the payload of the message, a header portion for identifying the respective message's type, and possibly padding.
  • Each Layer 1 burst and each Layer 2 frame is divided into a plurality of different fields. In particular, a limited-length DATA field in each Layer 2 frame contains the Layer 3 message 11.
  • Layer 3 messages have variable lengths depending upon the amount of information contained in the Layer 3 message
  • a plurality of Layer 2 frames may be needed for transmission of a single Layer 3 message.
  • a plurality of Layer 1 channel bursts may also be needed to transmit the entire Layer 3 message as there is a one-to-one correspondence between channel bursts and Layer 2 frames.
  • FIG. 2(a) shows a general example of a forward (or downlink) DCCH configured as a succession of time slots 1 , 2, . . .
  • DCCH slots may be defmed on a radio channel such as that specified by TIA/EIA/IS-136, and may consist, as seen in FIG. 2(a) for example, of every n-th slot in a series of consecutive slots.
  • Each DCCH slot has a duration that may or may not be 6.67 msec, which is the length of a DTC slot according to the TIA/EIA/IS-136 standard.
  • the DCCH slots may be organized into superf rames (SF), and each superframe includes a number of logical channels that carry different kinds of information.
  • One or more DCCH slots may be allocated to each logical channel in the superframe.
  • the exemplary downlink superframe in FIG. 2(a) includes three logical channels: a broadcast control channel (BCCH) including six successive slots for overhead messages; a paging channel (PCH) including one slot for paging messages; and an access response channel (ARCH) including one slot for channel assignment and other messages.
  • the remaining time slots in the exemplary superframe of FIG. 2(a) may be dedicated to other logical channels, such as additional paging channels PCH or other channels.
  • FIG. 2(b) illustrates a preferred information format for the slots of a forward
  • the information transferred in each slot comprises a plurality of fields, and FIG. 2(b) indicates the number of bits in each field above that field.
  • the bits sent in the SYNC field are used in a conventional way to help ensure accurate reception of the coded superframe phase (CSFP) and DATA fields.
  • the SYNC field includes a predetermined bit pattern used by the base stations to find the start of the slot.
  • the shared channel feedback (SCF) field is used to control a random access channel (RACH), which is used by the mobile to request access to the system.
  • RACH random access channel
  • the CSFP field conveys a coded superframe phase value that enables the mobile stations to find the start of each superframe. This is just one example for the information format in the slots of the forward DCCH.
  • the BCCH may be divided into a number of sub-channels.
  • a BCCH structure is known that allows the mobile station to read a minimum amount of information when it is switched on (when it locks onto a DCCH) before being able to access the system (place or receive a call). After being switched on, an idle mobile station needs to regularly monitor only its assigned PCH slots (usually one in each superframe); the mobile can sleep during other slots.
  • the ratio of the mobile's time spent reading paging messages and its time spent asleep is controllable and represents a tradeoff between call-set-up delay and power consumption. Since each TDMA time slot has a certain fixed information carrying capacity, each burst typically carries only a portion of a Layer 3 message as noted above.
  • any given Layer 3 message must be carried using as many TDMA channel bursts as required to send the entire Layer 3 message.
  • Digital control and traffic channels are desirable for reasons, such as supporting longer sleep periods for the mobile units, which results in longer battery life, for example.
  • Digital traffic channels and digital control channels have expanded functionality for optimizing system capacity and supporting hierarchical cell structures, i.e. , structures of macrocells, microcells, picocells, etc.
  • the term "macrocell” generally refers to a cell having a size comparable to the sizes of cells in a conventional cellular telephone system (e.g., a radius of at least about 1 kilometer), and the terms "microcell” and “picocell” generally refer to progressively smaller cells.
  • a microcell might cover a public indoor or outdoor area, e.g.
  • a convention center or a busy street, and a picocell might cover an office corridor or a floor of a high-rise building.
  • macrocells, microcells, and picocells may be distinct from one another or may overlap one another to handle different traffic patterns or radio environments.
  • FIG. 3 is an exemplary hierarchical, or multi-layered, cellular system.
  • An umbrella macrocell 10 represented by a hexagonal shape makes up an overlying cellular structure.
  • Each umbrella cell may contain an underlying microcell structure.
  • the umbrella cell 10 includes microcell 20 represented by the area enclosed within the dotted line and microcell 30 represented by the area enclosed within the dashed line corresponding to areas along city streets, and picocells 40, 50, and 60, which cover individual floors of a building.
  • the intersection of the two city streets covered by the microcells 20 and 30 may be an area of dense traffic concentration, and thus might represent a hot spot.
  • FIG. 4 represents a block diagram of an exemplary cellular mobile radiotelephone system, including an exemplary base station 110 and mobile station 120.
  • the base station includes a control and processing unit 130 which is connected to the MSC 140 which in turn is connected to the PSTN (not shown).
  • MSC 140 which in turn is connected to the PSTN (not shown).
  • PSTN Public Switched Telephone Network
  • the base station 110 handles a plurality of voice channels through a voice channel transceiver 150, which is controlled by the control and processing unit 130.
  • each base station includes a control channel transceiver 160, which may be capable of handling more than one control channel.
  • the control channel transceiver 160 is controlled by the control and processing unit 130.
  • the control channel transceiver 160 broadcasts control information over the control channel of the base station or cell to mobiles locked to that control channel. It will be understood that the transceivers 150 and 160 can be implemented as a single device, like the voice and control transceiver 170, for use with DCCHs and DTCs that share the same radio carrier frequency.
  • the mobile station 120 receives the information broadcast on a control channel at its voice and control channel transceiver 170. Then, the processing unit 180 evaluates the received control channel information, which includes the characteristics of cells that are candidates for the mobile station to lock on to, and determines on which cell the mobile should lock.
  • the received control channel information not only includes absolute information concerning the cell with which it is associated, but also contains relative information concerning other cells proximate to the cell with which the control channel is associated, as described in U.S. Patent No. 5,353,332 to Raith et al. , entitled “Method and Apparatus for Communication Control in a Radiotelephone System, " which is inco ⁇ orated in this application by reference.
  • a digital forward control channel (base station to mobile station) may be provided that can carry the types of messages specified for current analog forward control channels (FOCCs), but in a format which allows an idle mobile station to read overhead messages when locking onto the FOCC and thereafter only when the information has changed; the mobile sleeps at all other times.
  • FCCs current analog forward control channels
  • some types of messages are broadcast by the base stations more frequently than other types, and mobile stations need not read every message broadcast.
  • circuit-switched technology is a type of "connection-oriented" communication that establishes a physical call connection and maintains that connection for as long as the communicating end-systems have data to exchange.
  • the direct connection of a circuit switch serves as an open pipeline, permitting the end- systems to use the circuit for whatever they deem appropriate. While circuit-switched data cornmunication may be well suited to constant-bandwidth applications, it is relatively inefficient for low-bandwidth and "bursty" applications.
  • Packet-switched technology which may be connection-oriented (e.g., X.25) or "connectionless” (e.g., the Internet Protocol, "IP"), does not require the set-up and tear-down of a physical connection, which is in marked contrast to circuit-switched technology. This reduces the data latency and increases the efficiency of a channel in handling relatively short, bursty, or interactive transactions.
  • a connectionless packet- switched network distributes the routing functions to multiple routing sites, thereby avoiding possible traffic bottlenecks that could occur when using a central switching hub. Data is "packetized” with the appropriate end-system addressing and then transmitted in independent units along the data path.
  • Routing decisions are based on a number of characteristics, including: least-cost route or cost metric; capacity of the link; number of packets waiting for transmission; security requirements for the link; and intermediate system (node) operational status. Packet transmission along a route that takes into consideration path metrics, as opposed to a single circuit set up, offers application and communications flexibility. It is also how most standard local area networks (LANs) and wide area networks (WANs) have evolved in the corporate environment. Packet switching is appropriate for data communications because many of the applications and devices used, such as keyboard terminals, are interactive and transmit data in bursts. Instead of a channel being idle while a user inputs more data into the terminal or pauses to think about a problem, packet switching interleaves multiple transmissions from several terminals onto the channel.
  • LANs local area networks
  • WANs wide area networks
  • Packet data provides more network robustness due to path independence and the routers' ability to select alternative paths in the event of network node failure. Packet switching, therefore, allows for more efficient use of the network lines. Packet technology offers the option of billing the end user based on amount of data transmitted instead of connection time. If the end user's application has been designed to make efficient use of the air link, then the number of packets transmitted will be minimal. If each individual user's traffic is held to a minimum, then the service provider has effectively increased network capacity.
  • Packet networks are usually designed and based on industry-wide data standards such as the open system interface (OSI) model or the TCP/IP protocol stack. These standards have been developed, whether formally or de facto, for many years, and the applications that use these protocols are readily available.
  • OSI open system interface
  • TCP/IP protocol stack TCP/IP protocol stack
  • Packet networks like the Internet or a corporate LAN, are integral parts of today's business and communications environments. As mobile computing becomes pervasive in these environments, wireless service providers such as those using TIA/EIA/IS-136 are best positioned to provide access to these networks. Nevertheless, the data services provided by or proposed for cellular systems are generally based on the circuit-switched mode of operation, using a dedicated radio channel for each active mobile user.
  • U.S. Patent No. 4,887,265 and "Packet Switching in Digital Cellular Systems", Proc. 38th IEEE Vehicular Technology Conf.. pp. 414-418 (June 1988) describe a cellular system providing shared packet data radio channels, each one capable of accommodating multiple data calls.
  • a mobile station requesting packet data service is assigned to a particular packet data charmel using essentially regular cellular signalling.
  • the system may include packet access points (PAPS) for interfacing with packet data networks.
  • PAPS packet access points
  • Each packet data radio channel is connected to one particular PAP and is thus capable of multiplexing data calls associated with that PAP.
  • Handovers are initiated by the system in a manner that is largely similar to the handover used in the same system for voice calls.
  • U.S. Patent No. 4,916,691 describes a new packet mode cellular radio system architecture and a new procedure for routing (voice and/or data) packets to a mobile station.
  • Base stations, public switches via trunk interface units, and a cellular control unit are linked together via a WAN.
  • the routing procedure is based on mobile- station-initiated handovers and on adding to the header of any packet transmitted from a mobile station (during a call) an identifier of the base station through which the packet passes.
  • the mobile station may transmit extra control packets for the purpose of conveying cell location information.
  • the cellular control unit is primarily involved at call establishment, when it assigns to the call a call control number. It then notifies the mobile station of the call control number and the trunk interface unit of the call control number and the identifier of the initial base station. During a call, packets are then routed directly between the trunk interface unit and the currently serving base station.
  • CDPD Cellular Digital Packet Data
  • AMPS Advanced Mobile Phone Service
  • CDPD is a comprehensive, open specification endorsed by a group of U.S. cellular operators. Items covered include external interfaces, air link interfaces, services, network architecture, network management, and administration.
  • the specified CDPD system is to a large extent based on an infrastructure that is independent of the existing AMPS infrastructure. Commonalities with AMPS systems are limited to utilization of the same type of radio frequency channels and the same base station sites (the base station used by CDPD may be new and CDPD specific) and employment of a signalling interface for coordinating channel assignments between the two systems.
  • Routing a packet to a mobile station is based on, first, routing the packet to a home network node (home Mobile Data Intermediate System, MD-IS) equipped with a home location register (HLR) based on the mobile station address; then, when necessary, routing the packet to a visited, serving MD-IS based on HLR information; and finally transferring the packet from the serving MD-IS via the current base station, based on the mobile station reporting its cell location to its serving MD-IS.
  • MD-IS home Mobile Data Intermediate System
  • HLR home location register
  • CDPD System Specification can be used as a basis for the network aspects needed for an air link protocol in accordance with this invention.
  • the CDPD network is designed to be an extension of existing data communications networks and the AMPS cellular network.
  • Existing connectionless network protocols may be used to access the CDPD network. Since the network is always considered to be evolving, it uses an open network design that allows the addition of new network layer protocols when appropriate.
  • the CDPD network services and protocols are limited to the Network Layer of the OSI model and below. Doing so allows upper-layer protocols and applications development without changing the underlying CDPD network.
  • the CDPD network is a wireless mobile extension of traditional networks, both data and voice.
  • a CDPD service provider network's service the subscriber is able to seamlessly access data applications, many of which may reside on traditional data networks.
  • the CDPD system may be viewed as two interrelated service sets: CDPD network support services and CDPD network services.
  • CDPD network support services perform duties necessary to maintain and administer the CDPD network. These services are: accounting server; network management system; message transfer server; and authentication server. These services are defined to permit interoperability among service providers. As the CDPD network evolves technically beyond its original AMPS infrastructure, it is anticipated that the network support services shall remain unchanged. The functions of network support services are necessary for any mobile network and are independent of radio frequency (RF) technology.
  • RF radio frequency
  • CDPD network services are data transfer services that allow subscribers to communicate with data applications. Additionally, one or both ends of the data communications may be mobile.
  • Examples of such IS- 136 random access parameters include maximum busy/reserved information, maximum retries information, maximum repetitions information, and a maximum stop counter. Since MACA reports are used before assigning traffic channels, MACA does not provide any information after the mobile station accesses the system.
  • An equalizer is primarily used in receiving circuits for the purpose of reducing the effects of multipath propagation and, in a cellular system, the effects of relative motion between the transmitter and receiver. This is described, for instance, in WO 88/05981, which relates to a TDMA system which includes so-called adaptive equalization.
  • the setting of the equalizer incorporated in the radio receiver is contingent on synchronizing words that are time multiplexed with data words transmitted from the radio transmitter. With the aid of these synchronizing words, the equalizer can be set so as to compensate for the dispersion properties of the medium.
  • Radio receivers which include equalizers are often used for high symbol rate communication ( > 100 kbit/s), where the bit sensitivity to multipath propagation is greater than the bit sensitivity of lower symbol rate communication.
  • equalizers One disadvantage of using equalizers is that they increase a receiver's complexity and power consumption.
  • a method for reassigning mobile stations a new phase within a channel is disclosed.
  • a plurality of mobile stations attempt to communicate on a limited number of channels.
  • the invention first uses a general allocation method to approximately evenly distribute the mobile stations on the available channels. After a mobile station begins active communication on the system, a second allocation method is used to change the phase of some mobile stations on a channel which has become heavily loaded.
  • a message can also be sent to mobile stations assigned to but not yet actively communicating on the heavily loaded channel indicating that the mobile stations should change to a new channel.
  • FIG. 1 schematically illustrates pluralities of Layer 3 messages, Layer 2 frames, and Layer 1 channel bursts, or time slots;
  • FIG. 2(a) shows a forward DCC configured as a succession of time slots included in the consecutive time slots sent on a carrier frequency
  • FIG. 2(b) shows an example of an IS- 136 DCCH field slot format
  • FIG. 3 illustrates an exemplary hierarchical, or multi-layered, cellular system
  • FIG. 4 is a block diagram of an exemplary cellular mobile radiotelephone system, including an exemplary base station and mobile station;
  • FIG. 5 illustrates one example of a possible mapping sequence
  • FIG. 6 illustrates an example of PDCH reassignment
  • FIG. 7 illustrates a flow chart according to one embodiment of this invention
  • FIG. 8 illustrates a full rate mobile station receiving a new phase assignment
  • FIG. 9 illustrates a double rate mobile station receiving a new phase assignment.
  • FIG. 5 shows a dedicated packet digital control channel (PDCH) example of how one L3 message is mapped into several Layer 2 frames, an example of a Layer 2 frame mapping onto a time slot, and an example of time slot mapping onto a PDCH channel.
  • PDCH dedicated packet digital control channel
  • the length of the forward packet digital control channel (FPDCH) time slots and reverse packet digital control channel (RPDCH) bursts are fixed, although there are three forms of RPDCH bursts which have different fixed lengths.
  • the FPDCH time slots are assumed to be on the physical layer in FIG. 5.
  • the TDMA frame structure is the same as for IS- 136 DCCH and DTC.
  • an additional FPDCH slot format is specified.
  • the digital control channel (DCCH) of IS- 136 is used to indicate PDCH operation.
  • FIG. 6 illustrates the relationship between PDCH's belonging to one cell (or more specifically, having a common mother DCCH) and DCCH's in different cells (more specifically, indicated in the DCCH neighboring list as candidates for DCCH reselection).
  • a mobile station always first goes to a DCCH (Mother DCCH) at initial cell selection. On the DCCH, the support for PDCH is indicated.
  • the carrier frequency of one PDCH (beacon PDCH) is provided.
  • a mobile station interested in packet data service then tunes to the Beacon PDCH and reads additional BCCH information to determine if a plurality of PDCHs exist. If more than one PDCH exists in the current service area a mobile station will select one as its Assigned PDCH according to hashing algorithm. If the Beacon PDCH is the only PDCH in the current service area it becomes the mobile station's Assigned PDCH.
  • a mobile station After determimng its Assigned PDCH a mobile station reads full cycle of fast packet BCCH (F-PBCCH) and extended packet BCCH (E-PBCCH) information on its Assigned PDCH. The mobile station then registers, if necessary, on its Assigned PDCH according to PDCH mobility management rules. A PDCH registration may result in the mobile station being directed to an alternate Assigned PDCH or maintaining its current Assigned PDCH. At this point the mobile station is activated for packet data service on its Assigned PDCH in addition to potentially being activated for cellular service on its Mother DCCH.
  • F-PBCCH fast packet BCCH
  • E-PBCCH extended packet BCCH
  • a plurality of mobile stations are attempting to communicate on a limited number of channels wherein each channel may contain a plurality of timeslots. From an efficiency point of view, it is advantageous not to have all of the mobile stations assigned to one channel, but rather to have them spread out over all the channels.
  • One phase allocation method is described below and is illustrated in FIG. 7.
  • a mobile station may proceed to register on its Assigned PDCH.
  • the serving system may choose to assign the mobile station to an alternate channel (e.g., alternate Assigned PDCH) in the interest of providing real time distribution of mobile stations to available channels according to channel utilization (e.g., packet data load).
  • channel utilization e.g., packet data load
  • initial selection of an Assigned PDCH by a mobile station may be based on mobile station identify (MSID or the last digit thereof) and provides an initial distribution of mobile stations across available channels
  • subsequent redistribution during registration can take place based on channel loading or mobile station attributes identified within a registration message.
  • the mobile station may indicate that it is a full-rate, double-rate, or triple-rate mobile station.
  • the system could consider one triple-rate mobile station to have the same potential load as three full-rate mobile stations when assigning channels at mobile station registration.
  • the system might assign two triple-rate mobile stations to one channel while assigning six full-rate mobile stations to another channel since the two triple-rate mobile stations have the same potential load as the six full-rate mobile stations.
  • the mobile stations After the mobile stations have been assigned to a packet data channel, the mobile stations are in a "waiting-for-packet" state wherein the mobile station is not communicating with the system. Mobile stations in the "waiting-for-packet" state read all of the timeslots except for the broadcast slots. In addition, a mobile station may be in a sleep mode wherein the mobile station regularly wakes up for short periods of time to read a single paging slot.
  • a full-rate mobile station can only listen to one of the three slots, i.e. , there are three possible phases (slot 1, slot 2, slot 3). For example, a full-rate mobile station will only be listening to one phase of its assigned channel, e.g. , a PPCH subchannel (PPCH SUBCH).
  • PPCH SUBCH a PPCH subchannel
  • a double-rate mobile station operates on two of the three possible slots (slots 1 and 2, slots 2 and 3, and slots 1 and 3).
  • a triple- rate mobile station operates on all of the slots, hence there is no rendezvous problem which needs to be solved.
  • the present invention solves the rendezvous problem by only paging mobile stations on a predetermined phase using a full-rate channel of the channel since all mobile stations must be able to operate at the full-rate. For example, the system only pages the mobile stations in the first phase of the channel.
  • the particular paging slot which is contained in one out of many TDMA frames can be determined using the permanent mobile station's identity which can be a MIN or an IMSI.
  • the paging slots are only assigned to a full-rate channel for several reasons.
  • the layer 2 frames are longer comparable to the frames in IS- 136, if less channel coding is used. This enhances the possibility of grouping multiple pages into a single layer 2 frame, avoiding the scattering of pages over all of the PDCH slots, e.g. , on a triple rate PDCH, there should not be too many paging slots in relation to the number of mobile stations camping on a PDCH.
  • the mobile stations When mobile stations have been assigned a PDCH channel but are not in the sleep mode, they read slots on the FPDCH according to their capabilities. As a result, the mobile stations can be assigned evenly to the different phases based upon some parameter, for example the mobile station identification number. Furthermore, the mobile stations may determine which phase (a subset of slots) to read according to Tables 1 and 2 illustrated below.
  • An alternative solution for the rendezvous problem for mobile stations in a sleep mode or a "waiting-for-packet" state is to send the mobile station the necessary synchronization in a registration response message.
  • the registration response message may contain the rate and phase information.
  • the PPCH subchannel does not need to be tied to the permanent mobile station identity and the paging channel must not be restricted to full-rate.
  • the assigned phase of a mobile station in the "waiting-for-packet" state can also be given in the registration response message.
  • a Layer 2 command can be used to inform the mobile station that it should change its phase, i.e., the mobile station should shift the phase on which it is transmitting and receiving.
  • the frequency (e.g. , channel number) of the mobile stations that are already communicating with the system are not changed. Thus, if there are too many mobile stations transmitting on a certain channel, only the phase within the channel can be shifted.
  • a Layer 3 message can be used to tell mobile stations that have not yet began communicating that they should switch to another channel so that when they begin to communicate, they will not be operating on an overloaded channel.
  • mobile stations may always default to a single phase determined by BCCH information sent out on the FPDCH.
  • the receiving system may choose to modify phase assignments at any time during the course of delivering packet data information to mobile station on the FPDCH receiving packet data information on the RPDCH.
  • a change in the phase allocation affects the forward and reverse channel.
  • the mobile station is allowed to maintain its current phase allocation for the next scheduled transmission event (one slot) for a full rate transmission and for the next two scheduled transmission events (two slots) for a double rate transmission.
  • FIGS. 8 and 9 illustrate examples of full rate and double rate mobile stations receiving a new phase assignment. As illustrated in FIGS. 8 and 9, the phase reassignment occurs after a full frame.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé permettant de réattribuer aux stations mobiles une nouvelle phase à l'intérieur d'un canal. Dans un système de communication, une pluralité de stations mobiles tentent de communiquer sur un nombre limité de canaux. L'invention fait d'abord appel à un procédé d'attribution générale qui permet de répartir d'une manière approximativement régulière les stations mobiles sur les canaux disponibles. Une fois que la station mobile a entamé une communication active sur le système, l'invention fait appel à un second procédé qui permet de modifier la phase de certaines stations mobiles sur un canal déjà fortement chargé. En outre, un message peut être envoyé aux stations mobiles qui ont déjà reçu leur attribution, mais qui ne communiquent pas encore activement sur le canal fortement chargé, ledit message leur indiquant qu'elles devraient passer sur un nouveau canal.
PCT/US1996/016686 1995-10-18 1996-10-18 Attribution de largeurs de bande WO1997015155A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BR9611117A BR9611117A (pt) 1995-10-18 1996-10-18 Processo de alocar estações a fases dentro de um canal em um sistema de comunicações e estação de base
GB9808186A GB2321166B (en) 1995-10-18 1996-10-18 Bandwidth allocation
AU74530/96A AU714610B2 (en) 1995-10-18 1996-10-18 Bandwidth allocation
DE19681599T DE19681599B4 (de) 1995-10-18 1996-10-18 Bandbreitenzuweisung

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/544,490 US5729531A (en) 1995-10-18 1995-10-18 Bandwidth allocation
US08/544,490 1995-10-18

Publications (1)

Publication Number Publication Date
WO1997015155A1 true WO1997015155A1 (fr) 1997-04-24

Family

ID=24172394

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1996/016686 WO1997015155A1 (fr) 1995-10-18 1996-10-18 Attribution de largeurs de bande

Country Status (9)

Country Link
US (1) US5729531A (fr)
KR (1) KR100420606B1 (fr)
AU (1) AU714610B2 (fr)
BR (1) BR9611117A (fr)
CA (1) CA2235156A1 (fr)
DE (1) DE19681599B4 (fr)
GB (1) GB2321166B (fr)
MX (1) MX9802982A (fr)
WO (1) WO1997015155A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2767617A1 (fr) * 1997-08-22 1999-02-26 Samsung Electronics Co Ltd Procede de commutation semi-douce utilisant des frequences communes multiples
WO1999038278A1 (fr) * 1998-01-24 1999-07-29 Samsung Electronics Co., Ltd. Procede de communication de donnees dans un systeme de communication mobile
WO2001097458A1 (fr) * 2000-06-13 2001-12-20 Red-M (Communications) Limited Dispositif de traitement d'appels permettant de commander des connexions sans fil au moyen de dispositifs de communications sans fil
US7564784B2 (en) 1998-11-27 2009-07-21 Mika Forssell Method and arrangement for transferring information in a packet radio service

Families Citing this family (85)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6775519B1 (en) * 1995-06-07 2004-08-10 Globalstar L.P. Method and apparatus for accounting for user terminal session-based connection to a satellite communication system
DE19545508C1 (de) * 1995-12-05 1997-06-05 Siemens Ag Verfahren zur Anpassung von adaptiven Funkteilnehmerstationen an Übertragungsnetze und eine entsprechende Funkteilnehmerstation
GB2362298B (en) 1996-12-06 2002-01-02 Immarsat Ltd Communication method and apparatus
US5991633A (en) * 1997-02-07 1999-11-23 Telefonaktiebolaget Lm Ericsson Method of dynamically controlling the length of a R-- DATA messages on a random access channel
US5991286A (en) * 1997-02-20 1999-11-23 Telefonaktiebolaget L M Ericsson (Publ) Support of multiple modulation levels for a cellular packet control channel
US5912878A (en) * 1997-02-27 1999-06-15 Motorola, Inc. Method and end station with improved user reponse time in a mobile network
US5940763A (en) * 1997-04-23 1999-08-17 Ericsson, Inc. Enhanced preemption within a mobile telecommunications network
US6532364B1 (en) * 1997-09-30 2003-03-11 Mitsubishi Denki Kabushiki Kaisha Mobile communication system with down-link frame numbering
US6226279B1 (en) * 1997-10-22 2001-05-01 Telefonaktiebolaget L M Ericsson (Publ) Allowing several multiple access schemes for packet data in a digital cellular communication system
US6216006B1 (en) * 1997-10-31 2001-04-10 Motorola, Inc. Method for an admission control function for a wireless data network
US6292664B1 (en) * 1998-02-06 2001-09-18 Telefon Aktiebolaget Lm Ericsson (Publ) Channel quality in wireless communications
US6131039A (en) * 1998-03-20 2000-10-10 Alcatel Usa Method and system for wireless telecommunications
CA2237289C (fr) 1998-03-24 2006-07-11 Vistar Telecommunications Inc. Systeme de communication de donnees par paquets
US6522638B1 (en) * 1998-03-24 2003-02-18 Vistar Telecommunications Inc. Packet data communication system with buffered data and control channels
US6795406B2 (en) 1999-07-12 2004-09-21 Genesys Telecommunications Laboratories, Inc. Methods and apparatus for enhancing wireless data network telephony, including quality of service monitoring and control
US6078566A (en) * 1998-04-28 2000-06-20 Genesys Telecommunications Laboratories, Inc. Noise reduction techniques and apparatus for enhancing wireless data network telephony
US6400954B1 (en) * 1998-05-15 2002-06-04 Tlelefonaktiebolaget Lm Ericsson (Publ) Methods and systems for mode selection based on access network capacity
EP0966125B1 (fr) * 1998-06-15 2007-04-04 Motorola, Inc. Méthode et appareil pour l'amélioration de la capacité dans un système de radiocommunication
US6166694A (en) * 1998-07-09 2000-12-26 Telefonaktiebolaget Lm Ericsson (Publ) Printed twin spiral dual band antenna
US6862622B2 (en) * 1998-07-10 2005-03-01 Van Drebbel Mariner Llc Transmission control protocol/internet protocol (TCP/IP) packet-centric wireless point to multi-point (PTMP) transmission system architecture
DE19833318C2 (de) * 1998-07-24 2001-08-02 Bosch Gmbh Robert Verfahren zur Übertragung von digitalen Nutzdaten
US6519248B1 (en) 1998-07-24 2003-02-11 Telefonaktiebolaget Lm Ericsson (Publ) Packet data network having distributed database
US6205336B1 (en) * 1998-08-14 2001-03-20 Telefonaktiebolaget Lm Ericsson (Publ) Method and system for improving network resource utilization in a cellular communication system
JP3617930B2 (ja) * 1998-09-30 2005-02-09 株式会社東芝 無線携帯端末装置、ゲートウェイ装置及び通信処理制御方法
US6963545B1 (en) * 1998-10-07 2005-11-08 At&T Corp. Voice-data integrated multiaccess by self-reservation and stabilized aloha contention
US6747959B1 (en) 1998-10-07 2004-06-08 At&T Corp. Voice data integrated mulitaccess by self-reservation and blocked binary tree resolution
US6603750B1 (en) * 1998-10-09 2003-08-05 Telefonaktiebolaget Lm Ericsson (Publ) Rehash timer for packet data communications
US6529734B1 (en) * 1998-11-03 2003-03-04 Telefonaktiebolaget Lm Ericsson Bandwith supply dependent cell level
US6201965B1 (en) * 1998-11-10 2001-03-13 Nortel Networks Limited Telecommunication subscriber connection using a domain name system
US6535736B1 (en) 1998-12-11 2003-03-18 Lucent Technologies Inc. System and method for variably delaying access requests in wireless communications system
US6480506B1 (en) * 1999-04-15 2002-11-12 Sharewave Inc Co-location negotiation scheme for wireless computer networks
US8462810B2 (en) 1999-05-21 2013-06-11 Wi-Lan, Inc. Method and system for adaptively obtaining bandwidth allocation requests
US6925068B1 (en) 1999-05-21 2005-08-02 Wi-Lan, Inc. Method and apparatus for allocating bandwidth in a wireless communication system
US7006530B2 (en) * 2000-12-22 2006-02-28 Wi-Lan, Inc. Method and system for adaptively obtaining bandwidth allocation requests
US20090219879A1 (en) 1999-05-21 2009-09-03 Wi-Lan, Inc. Method and apparatus for bandwidth request/grant protocols in a wireless communication system
US6804211B1 (en) 1999-08-03 2004-10-12 Wi-Lan Inc. Frame structure for an adaptive modulation wireless communication system
KR20010028048A (ko) * 1999-09-17 2001-04-06 박종섭 고속 데이터 전송을 위한 티씨이 자원 할당 방식
DE19948367B4 (de) * 1999-10-07 2010-04-22 Siemens Ag Flexible Zuweisung von Übertragungsressourcen zu bestehenden logischen Verbindungen
US6944141B1 (en) * 1999-10-22 2005-09-13 Lucent Technologies Inc. Systems and method for phase multiplexing in assigning frequency channels for a wireless communication network
US6678252B1 (en) * 1999-10-28 2004-01-13 Verizon Laboratories Inc. Method and apparatus for dynamic source routing in ad hoc wireless networks
US6654384B1 (en) * 1999-12-30 2003-11-25 Aperto Networks, Inc. Integrated self-optimizing multi-parameter and multi-variable point to multipoint communication system
US6650623B1 (en) 1999-12-30 2003-11-18 Aperto Networks, Inc. Adaptive link layer for point to multipoint communication system
US7366133B1 (en) * 1999-12-30 2008-04-29 Aperto Networks, Inc. Integrated, self-optimizing, multi-parameter/multi-variable point-to-multipoint communication system [II]
US6473597B1 (en) * 2000-04-12 2002-10-29 Thomas M. Johnson Method and apparatus for modeling transmitter bandwidth for telecommunications analysis
US7092363B1 (en) * 2000-06-26 2006-08-15 Aperto Networks, Inc. High-capacity scalable integrated wireless backhaul for broadband access networks
US7039032B1 (en) * 2000-07-14 2006-05-02 At&T Corp. Multipoll for QoS-Driven wireless LANs
US7068632B1 (en) * 2000-07-14 2006-06-27 At&T Corp. RSVP/SBM based up-stream session setup, modification, and teardown for QOS-driven wireless LANs
US7068633B1 (en) 2000-07-14 2006-06-27 At&T Corp. Enhanced channel access mechanisms for QoS-driven wireless lans
US6950397B1 (en) 2000-07-14 2005-09-27 At&T Corp. RSVP/SBM based side-stream session setup, modification, and teardown for QoS-driven wireless lans
US7031287B1 (en) 2000-07-14 2006-04-18 At&T Corp. Centralized contention and reservation request for QoS-driven wireless LANs
US7756092B1 (en) 2000-07-14 2010-07-13 At&T Intellectual Property Ii, L.P. In-band QoS signaling reference model for QoS-driven wireless LANs connected to one or more networks
US6804222B1 (en) * 2000-07-14 2004-10-12 At&T Corp. In-band Qos signaling reference model for QoS-driven wireless LANs
US7151762B1 (en) 2000-07-14 2006-12-19 At&T Corp. Virtual streams for QoS-driven wireless LANs
US6636488B1 (en) 2000-10-11 2003-10-21 Aperto Networks, Inc. Automatic retransmission and error recovery for packet oriented point-to-multipoint communication
CA2853156C (fr) 2000-11-15 2015-03-24 Wi-Lan, Inc. Verrouillage de trame ameliore pour systeme de communication a modulation adaptative
US20050065779A1 (en) * 2001-03-29 2005-03-24 Gilad Odinak Comprehensive multiple feature telematics system
USRE46109E1 (en) 2001-03-29 2016-08-16 Lg Electronics Inc. Vehicle navigation system and method
US8175886B2 (en) 2001-03-29 2012-05-08 Intellisist, Inc. Determination of signal-processing approach based on signal destination characteristics
US20020143611A1 (en) * 2001-03-29 2002-10-03 Gilad Odinak Vehicle parking validation system and method
US7236777B2 (en) 2002-05-16 2007-06-26 Intellisist, Inc. System and method for dynamically configuring wireless network geographic coverage or service levels
US6487494B2 (en) * 2001-03-29 2002-11-26 Wingcast, Llc System and method for reducing the amount of repetitive data sent by a server to a client for vehicle navigation
US6885735B2 (en) * 2001-03-29 2005-04-26 Intellisist, Llc System and method for transmitting voice input from a remote location over a wireless data channel
US7139251B1 (en) 2001-05-29 2006-11-21 Aperto Networks, Inc. Scheduling for links having changing parameters
US20030217157A1 (en) * 2002-03-28 2003-11-20 Tung Sharon W. Method and apparatus to reduce wireless data transfer delay
US20030202487A1 (en) * 2002-04-26 2003-10-30 Harris John M. Method and apparatus for reducing call setup time
US20030235180A1 (en) * 2002-04-26 2003-12-25 Valentin Oprescu-Surcobe Method and apparatus for efficient channel assignment
US8942713B2 (en) * 2005-02-08 2015-01-27 Qualcomm Incorporated Method and apparatus for allocating resources in a multicast/broadcast communications system
EP1701487A1 (fr) * 2005-03-07 2006-09-13 France Telecom Adaptation de largeur de bande en fuction de la charge de réseau
JP4718227B2 (ja) * 2005-04-14 2011-07-06 株式会社日立製作所 無線通信システム、これを構成する無線中継装置及び無線通信端末、及び無線中継装置の通信負荷調整方法
JP5208138B2 (ja) * 2007-03-06 2013-06-12 スペクトラム ブリッジ， インコーポレイテッド スペクトル管理のシステム及び方法
US8340664B2 (en) * 2007-08-03 2012-12-25 Qualcomm Incorporated Cell reselection in a wireless communication system
US8160599B2 (en) * 2009-04-14 2012-04-17 Spectrum Bridge, Inc. System and method for managing spectrum allocation
US8233928B2 (en) * 2009-09-29 2012-07-31 Spectrum Bridge, Inc. System and method for managing spectrum allocation
US8279823B2 (en) 2010-02-09 2012-10-02 Spectrum Bridge, Inc. Spectrum allocation system and method
US9066238B2 (en) * 2010-02-22 2015-06-23 Spectrum Bridge. Inc. System and method for spectrum sharing among plural wireless radio networks
US8576817B2 (en) 2010-04-08 2013-11-05 Spectrum Bridge, Inc. System and method for managing radio access to spectrum and to a spectrum management system
US8406188B2 (en) 2010-05-11 2013-03-26 Spectrum Bridge, Inc. System and method for managing a wireless radio network
US8380194B2 (en) 2010-06-15 2013-02-19 Spectrum Bridge, Inc. System and method for providing network access to electronic devices
US8504087B2 (en) 2010-12-17 2013-08-06 Spectrum Bridge, Inc. System and method for controlling access to spectrum for wireless communications
US8644868B2 (en) 2011-03-07 2014-02-04 Spectrum Bridge, Inc. System and method for managing spectrum allocation
US8989742B2 (en) 2011-06-17 2015-03-24 Qualcomm Incorporated Methods and apparatus for inter-rat cell reselection
US9241302B2 (en) 2011-06-17 2016-01-19 Qualcomm Incorporated Methods and apparatus for radio access technology search
US9967814B2 (en) * 2012-06-14 2018-05-08 Blackberry Limited Automatic tracking of mobile device camping failure to an access point
US9137740B2 (en) 2012-09-10 2015-09-15 Spectrum Bridge, Inc. System and method for providing network access to electronic devices using bandwidth provisioning
US10982705B2 (en) 2018-03-16 2021-04-20 The Boeing Company Method, apparatus and applicator for applying a coating on a surface of a lamination

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5355374A (en) * 1992-05-08 1994-10-11 Scientific-Atlanta, Inc. Communication network with divisible auxilliary channel allocation
WO1995016330A1 (fr) * 1993-12-10 1995-06-15 Telefonaktiebolaget Lm Ericsson Appareils et stations mobiles permettant d'assurer la communication par paquets de donnees dans des systemes cellulaires amrt
DE4402903A1 (de) * 1994-02-02 1995-08-03 Deutsche Telekom Mobil Verfahren zur paketweisen Datenübertragung in einem Mobilfunknetz
WO1995031077A1 (fr) * 1994-05-10 1995-11-16 Alcatel Mobile Communication France Procede d'acces paquet dans un systeme de radiocommunication numerique cellulaire

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4887265A (en) * 1988-03-18 1989-12-12 Motorola, Inc. Packet-switched cellular telephone system
US4916691A (en) * 1988-10-28 1990-04-10 American Telephone And Telegraph Company Telecommunications switching system
US5175867A (en) * 1991-03-15 1992-12-29 Telefonaktiebolaget L M Ericsson Neighbor-assisted handoff in a cellular communications system
US5353332A (en) * 1992-09-16 1994-10-04 Ericsson Ge Mobile Communications Inc. Method and apparatus for communication control in a radiotelephone system
US5603081A (en) * 1993-11-01 1997-02-11 Telefonaktiebolaget Lm Ericsson Method for communicating in a wireless communication system
US5519691A (en) * 1994-06-03 1996-05-21 At&T Corp. Arrangement for and method of providing radio frequency access to a switching system
US5574974A (en) * 1995-03-20 1996-11-12 Telefonaktiebolaget Lm Ericsson Adaptive channel allocation in a mobile communications system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5355374A (en) * 1992-05-08 1994-10-11 Scientific-Atlanta, Inc. Communication network with divisible auxilliary channel allocation
WO1995016330A1 (fr) * 1993-12-10 1995-06-15 Telefonaktiebolaget Lm Ericsson Appareils et stations mobiles permettant d'assurer la communication par paquets de donnees dans des systemes cellulaires amrt
DE4402903A1 (de) * 1994-02-02 1995-08-03 Deutsche Telekom Mobil Verfahren zur paketweisen Datenübertragung in einem Mobilfunknetz
WO1995031077A1 (fr) * 1994-05-10 1995-11-16 Alcatel Mobile Communication France Procede d'acces paquet dans un systeme de radiocommunication numerique cellulaire

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2767617A1 (fr) * 1997-08-22 1999-02-26 Samsung Electronics Co Ltd Procede de commutation semi-douce utilisant des frequences communes multiples
WO1999038278A1 (fr) * 1998-01-24 1999-07-29 Samsung Electronics Co., Ltd. Procede de communication de donnees dans un systeme de communication mobile
AU719193B2 (en) * 1998-01-24 2000-05-04 Samsung Electronics Co., Ltd. Data communication method in mobile communication system
US7564784B2 (en) 1998-11-27 2009-07-21 Mika Forssell Method and arrangement for transferring information in a packet radio service
US8213304B2 (en) 1998-11-27 2012-07-03 Intellectual Ventures I Llc Method and arrangement for transferring information in a packet radio service
US8531949B2 (en) 1998-11-27 2013-09-10 Intellectual Ventures I Llc Method and arrangement for transferring information in a packet radio service
US9001652B2 (en) 1998-11-27 2015-04-07 Intellectual Ventures I Llc Method and arrangement for transferring information in a packet radio service
WO2001097458A1 (fr) * 2000-06-13 2001-12-20 Red-M (Communications) Limited Dispositif de traitement d'appels permettant de commander des connexions sans fil au moyen de dispositifs de communications sans fil

Also Published As

Publication number Publication date
GB2321166B (en) 2000-03-22
DE19681599B4 (de) 2005-12-22
BR9611117A (pt) 1999-07-13
GB9808186D0 (en) 1998-06-17
KR19990064311A (ko) 1999-07-26
MX9802982A (es) 1998-11-30
GB2321166A (en) 1998-07-15
DE19681599T1 (de) 1998-11-05
AU714610B2 (en) 2000-01-06
CA2235156A1 (fr) 1997-04-24
US5729531A (en) 1998-03-17
KR100420606B1 (ko) 2004-04-17
AU7453096A (en) 1997-05-07

Similar Documents

Publication Publication Date Title
AU714610B2 (en) Bandwidth allocation
US5757813A (en) Method for achieving optimal channel coding in a communication system
US5907555A (en) Method for compensating for time dispersion in a communication system
US5768267A (en) Method for system registration and cell reselection
AU715050B2 (en) Operating mobile stations of wireless communication systems in multiple modes by external control
US6016428A (en) Registration control of mobile stations in a wireless communication system
US5806007A (en) Activity control for a mobile station in a wireless communication system
US6018661A (en) Inhibiting and controlling signal strength measurements by a mobile station in a wireless communication system
US6597680B1 (en) Packet traffic channel reassignment
US5818829A (en) Method for increasing throughput capacity in a communication system
US6081514A (en) Method and apparatus for enhanced functions using a reserved field
US5910949A (en) Packet channel feedback
WO1997015126A9 (fr) Procede de compensation de la dispersion temporelle dans un systeme de communication
WO1997015165A9 (fr) Retour d'information par canal paquets
US6091960A (en) Method for paging mobile stations
US5903552A (en) Discriminating between channels in wireless communication systems
WO1997015163A1 (fr) Procede ameliore d'attribution de canaux
CA2235154C (fr) Procede ameliore d'attribution de canaux
CA2235155C (fr) Gestion de l'enregistrement des stations dans un systeme de radiocommunication
CA2235000A1 (fr) Procede d'enregistrement par un systeme et de reselection de cellules
AU6171699A (en) Simplifying decoding of codewords in a wireless communication system

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 96198922.X

Country of ref document: CN

AK Designated states

Kind code of ref document: A1

Designated state(s): AL AM AT AU AZ BA BB BG BR BY CA CH CN CU CZ DE DK EE ES FI GB GE HU IL IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK TJ TM TR TT UA UG UZ VN AM AZ BY KG KZ MD RU TJ TM

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): KE LS MW SD SZ UG AT BE CH DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
ENP Entry into the national phase

Ref document number: 2235156

Country of ref document: CA

Ref document number: 2235156

Country of ref document: CA

Kind code of ref document: A

WWE Wipo information: entry into national phase

Ref document number: PA/A/1998/002982

Country of ref document: MX

WWE Wipo information: entry into national phase

Ref document number: 1019980702807

Country of ref document: KR

NENP Non-entry into the national phase

Ref document number: 97516018

Country of ref document: JP

RET De translation (de og part 6b)

Ref document number: 19681599

Country of ref document: DE

Date of ref document: 19981105

WWE Wipo information: entry into national phase

Ref document number: 19681599

Country of ref document: DE

122 Ep: pct application non-entry in european phase
WWP Wipo information: published in national office

Ref document number: 1019980702807

Country of ref document: KR

WWG Wipo information: grant in national office

Ref document number: 1019980702807

Country of ref document: KR

REG Reference to national code

Ref country code: DE

Ref legal event code: 8607

REG Reference to national code

Ref country code: DE

Ref legal event code: 8607